At my dojo we apologize if anything like that happens, but our sensei and sempai say it is their job to be aware and stay out of our way (though I feel it is my job not to run into them or send my uke rolling into them as well)

~Look into the eyes of your opponent & steal his spirit.
~To be a good martial artist is to be good thief; if you want my knowledge, you must take it from me.